🌟 Java Automation : Check if a String Contains a Substring in Java!

Описание: 🔎 "True or False — Let’s Find Out if It’s In There!"
🧩 What’s the Goal of This Program?
This Java program demonstrates how to check whether one string contains another using the contains() method — a must-have tool in your Java toolkit for validations, automation, or string matching.

Useful in automation testing to verify text on UI, logs, API responses, and more!

🧠 Step-by-Step Walkthrough: What’s Going On?
1️⃣ Define the Main String
A base string is defined that represents a complete sentence or value.
Example: "Selenium Automation"

2️⃣ Define the Substring to Check
A second string is defined that may or may not be part of the first one.
Example: "Automation"

This is the target you're checking for inside the main string.

3️⃣ Use the contains() Method
The contains() method is called on the main string.

It checks if the substring exists anywhere inside the main string.

Returns true if found, otherwise false.

4️⃣ Print the Result
Displays a message that includes both the main string and the substring, along with the result (true or false).

Example output:
Does the string "Selenium Automation" contain "Automation"? true

🎓 Top 5 Java String Interview Questions
1. Q: What is the difference between == and equals()?
👉 == compares references (memory locations), while equals() compares actual content of the strings.

2. Q: What is the String pool in Java?
👉 It’s a special area in memory where Java stores string literals to save space and improve performance.

3. Q: How do you compare strings ignoring case?
👉 Use equalsIgnoreCase() — it compares two strings while ignoring case differences.

4. Q: What does immutability of Strings mean in Java?
👉 It means once a string is created, it cannot be changed. Any modification creates a new string object.

5. Q: How do you convert a string into a number in Java?
👉 Use wrapper class methods like Integer.parseInt() or Double.parseDouble().

🧾 Wrapping Up: Substring Checks Are Super Handy
Knowing how to check if a string contains a specific word or phrase is one of the simplest yet most important string operations. Whether validating messages in UI tests, checking input values, or parsing data — contains() gives you the answer in a flash.

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